Pulley



Aug 11, 1931- A. l.. FREDLANDER 1,818,798

PULLEY Filed April 11, 1928 Juve/fm ABRAHAM LFREEDLANDER, 'l

Patented Aug. 11, 1931 s PATENT OFFICE ABRAHAM L. FREDLANDER, OF DAYTON,OHIO v IPULLEY Application led April 11,

It is the object of this invention to provide a pulley which would beused in connection with V-shaped belts, but infact can be used vwithbelts of any general circular form or (il shape.

It'is especiallythe object of this invention to provide a pulley inwhich a minimum amount of material can be used, where there is smallspace and great strength, durability and pulling force. It is a specialobject of this invention to provide a pulley in which the surfacecontact between the pulley and the belt is maximum for the size of thepulley and the size of the belt.

These objects are eected by forming a pulley in which the belt seat isformed V- shape with the sides thereof concave and adapted to receiveand cooperate with a belt of the general V-shape, or a belt in which thesides are more or less convex, being adapted to fit snugly and compactlywithin the belt seat.

The accompanying drawings illustrate one embodiment of this invention,and are used for the purpose of illustration.

In the drawings, Figure 1 illustrates a side view of the pulley, showingthe form of the flanges and the resultant belt seat.

Fi ure 2 is an end view showing the orifice 80 bylw ich the pulley isadapted to be applied to shafts, or other caring.

Figure 3 is a cross section of a belt particularly adapted to be usedfor this form of pulley.

Figure 4 is a cross section of a form of V shaped belt. p

Figure 5 is a cross sectionl of the belt and the pulley assembled,showing the belt in close engagement with the pulley.

In the drawings, the numeral 1 illustrates or represents the pulley as awhole, which has extending therethrough the hole 2, through which aspindle or shaft or axle may pass,

and upon .which the pulley rotates. The numeral 3 illustrates a holethrough which the Y pulley may be fastened to the shaft, or it may \l%usdfenanuther purpose necessary. f

Extending around the body of the pulley 2 is a flange 4, having one sidethereof sub-V stantially perpendicular to the body of the 192s. serialNo. 269,179'.

pulley, and the other side more or less inclined to form somewhat of aconcave circular surface. 1

At the end of the pulley and adjacent the flange 4 is the flange v5,having an outside 55 thereof substantially perpendicular to the axis ofthe pulley and the inside surface 7 inclined to the axis and formed inconcave manner, and forming with the concave part of the flange 4concave cavities, indicated by 60 the numeral 7 cooperating with eachother to form the belt seat. The outer edges of the surfaces 7 aresubstantially perpendicular to the axis of the pulley but these surfacesapproach each other as they` reach the fiat bottom 6 of the seat.-

The lower part of the belt seat formed by the inside walls of theflanges is indicated by the numeral 6, and is of substantially the samediameter and circumference as the body of the pulley, but in this caseforms no part of the pulling effect when engaged byl the belt.

For the purpose of use with the pulley seat, as indicated by the numeral7, there may be formed a belt of the general form in cross section ofthat illustrated in Figure 3. In this figure there is shown a crosssection of a belt with the upper and lower faces parallel with eachother, and the sides convex adapted to fit into and engage the concavesides of 30 the pulley. l

When a pulley of this general shape and structure is made, the sides fiteach other without very much distortion of the belt, and

-for that reason a belt in this particular instance might be made ofsubstantially homogeneous. material, or it might belnade as shown byFigures 3 and 4, ofmaterial made' of layers `of fabric; preferably withthe edges exposed and known as a raw edge belt. In Figures 3 and 4 themiddle layer of the fabric, indicated by the numeral 8, is composed ofmaterial that is stiff,- more or less rigid, and non-expansible andnon-compressible, while the outer layers 9 and 10 are composed ofmaterial that is expansible,A contractable and compressible. I The partof the belt indicated b the nu- `meral 8 indicates the -main body o thebelt and gives very little longitudinally when it comes into engagementwith the side of the ric extending to deformable sides thereof pulley,while the parts 9 and 10 constitute the Will engage with the curved sideWalls of the more pliable and yielding parts of the belt pulley fordriving purposes.

and are adapted to give when brought into contact withthe pulley. Rubber8" is interposed between the fabric layers 8, 9 and 10.

These parts adjust themselves to the shape 'i of the pulley, and therebymore readily effect a complete surface contact between the pulley faceand the sides ofthe belt.

In case the form of belt illustrated in Fig ure 4 is used, it willassume, on application to the lpulley seat, kthe general formillustrated in Figure 5. The upper and lower parts 'of the belt arecompressed to engage firmly the side of the pulley groove and make aclose contacting engagement with the pulley, thereby increasing thepulling effect of the belt upon the pulley and the area of fricf tionalcontact.

Of course, if that form of belt illustrated in Figure 3 is used', thereis very little 'distortion in the shape of the belt, and each part ofthe belt contacts with the side of the pulley with substantially thesame degree of pressure. But this pressure increases with the pull onthe belt, tending to wedge it down into the seat of the pulley. But itis intended at no time that the belt shall engage the lower sur face ofthe pulley groove, but that all friction and pull shall be upon the sideof the belt engaging the concave side of the pulley.

I desire to comprehend Within my invention such modifications as may beclearly embraced within the claims and the scope of my invention.

Havin thus fully described my invention, Y what I c aim is newV anddesire to secure by Letters Patent, is: y

1. In combination, a V ty longitudinally inextensible transversely deormable straight Wall'beltof vulcanized rubber and fabric,

and a grooved pulley having concavely curved sides adaptedto receive andsupport said belt so that the side walls of the belt oonf()rm tothecrosssection of the groove of' the pulley.

2. In combination, a comblned vV t ,belt of fabric and rubber'vulcanizedinto a straight Wall belt of trapezoid'section later-lv ally deformableand transversely flexible,

and a groove pulley having concavely curved sides for receiving anddeforming said belt, the fabric of said belt being bendable along l anytransverse lairis of said' belt.

3. In combination', a combined V type belt 4of fabric and rubbervulcanized into a straight wall belt of trapezoid section later- Vallydeformable and transversely flexible,

" being so arranged that the raw edges of fab- In testimony whereof, Iaiiix my signature.

ABRAHAM L. FREEDLANDER.

